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A Candidate Codec Algorithm on Superwideband Extension to ITU-T G.711.1 and G.722  

Sung, Jong-Mo (ETRI)
Kim, Hyun-Woo (ETRI)
Kim, Do-Young (ETRI)
Lee, Byung-Sun (ETRI)
Ko, Yun-Ho (Chungnam National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.47, no.5, 2010 , pp. 62-73 More about this Journal
Abstract
In this paper we proposed a candidate algorithm on G.711.1 and G.722 superwideband extension codec which is under standardization by ITU-T. The proposed codec not only provides an interoperable bitstream with ITU-T G.711.1 and G.722, but also encodes a superwideband signal with a bandwidth of 50-14,000 Hz using superwideband extension layer. The candidate codec consists of a core layer to provide an interoperability with conventional wideband codecs and superwideband extension layer using linear prediction-based sinusoidal coding. The proposed extension codec operates on 5ms frame and provides four superwideband bitrates of 64, 80, 96, and 112 kbit/s depending on the core codec. Since the resulting bitstream has an embedded structure, it can be converted into core bitstream by simple truncation without transcoding. The proposed codec has a short algorithmic delay and low complexity and passed the qualification test of G.711.1 and G.722 superwideband extension codec performed by ITU-T.
Keywords
G.711.1; G.722;
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  • Reference
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